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drm/mediatek: dsi: Move mtk_dsi_stop() call back to mtk_dsi_poweroff()

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[ Upstream commit 90144dd8b0d137d9e78ef34b3c418e51a49299ad ]

As the comment right before the mtk_dsi_stop() call advises,
mtk_dsi_stop() should only be called after
mtk_drm_crtc_atomic_disable(). That's because that function calls
drm_crtc_wait_one_vblank(), which requires the vblank irq to be enabled.

Previously mtk_dsi_stop(), being in mtk_dsi_poweroff() and guarded by a
refcount, would only be called at the end of
mtk_drm_crtc_atomic_disable(), through the call to mtk_crtc_ddp_hw_fini().
Commit cde7e2e35c28 ("drm/mediatek: Separate poweron/poweroff from
enable/disable and define new funcs") moved the mtk_dsi_stop() call to
mtk_output_dsi_disable(), causing it to be called before
mtk_drm_crtc_atomic_disable(), and consequently generating vblank
timeout warnings during suspend.

Move the mtk_dsi_stop() call back to mtk_dsi_poweroff() so that we have
a working vblank irq during mtk_drm_crtc_atomic_disable() and stop
getting vblank timeout warnings.

Fixes: cde7e2e35c28 ("drm/mediatek: Separate poweron/poweroff from enable/disable and define new funcs")
Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
Link: http://lists.infradead.org/pipermail/linux-mediatek/2022-August/046713.html
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nícolas F. R. A. Prado 2022-08-04 15:43:25 -04:00 committed by Greg Kroah-Hartman
parent c990621606
commit fd938b4ce0
1 changed files with 10 additions and 11 deletions
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21
drivers/gpu/drm/mediatek/mtk_dsi.c
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@ -668,6 +668,16 @@ static void mtk_dsi_poweroff(struct mtk_dsi *dsi)
if (--dsi->refcount != 0)
return;
/*
* mtk_dsi_stop() and mtk_dsi_start() is asymmetric, since
* mtk_dsi_stop() should be called after mtk_drm_crtc_atomic_disable(),
* which needs irq for vblank, and mtk_dsi_stop() will disable irq.
* mtk_dsi_start() needs to be called in mtk_output_dsi_enable(),
* after dsi is fully set.
*/
mtk_dsi_stop(dsi);
mtk_dsi_switch_to_cmd_mode(dsi, VM_DONE_INT_FLAG, 500);
mtk_dsi_reset_engine(dsi);
mtk_dsi_lane0_ulp_mode_enter(dsi);
mtk_dsi_clk_ulp_mode_enter(dsi);
@ -718,17 +728,6 @@ static void mtk_output_dsi_disable(struct mtk_dsi *dsi)
if (!dsi->enabled)
return;
/*
* mtk_dsi_stop() and mtk_dsi_start() is asymmetric, since
* mtk_dsi_stop() should be called after mtk_drm_crtc_atomic_disable(),
* which needs irq for vblank, and mtk_dsi_stop() will disable irq.
* mtk_dsi_start() needs to be called in mtk_output_dsi_enable(),
* after dsi is fully set.
*/
mtk_dsi_stop(dsi);
mtk_dsi_switch_to_cmd_mode(dsi, VM_DONE_INT_FLAG, 500);
dsi->enabled = false;
}